678421584 has 120 divisors (see below), whose sum is σ = 2018120832. Its totient is φ = 212014080.

The previous prime is 678421573. The next prime is 678421613. The reversal of 678421584 is 485124876.

678421584 is a `hidden beast` number, since 67 + 8 + 4 + 2 + 1 + 584 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1054767 + ... + 1055409.

Almost surely, 2^678421584 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678421584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1009060416).

678421584 is an abundant number, since it is smaller than the sum of its proper divisors (1339699248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678421584 is a wasteful number, since it uses less digits than its factorization.

678421584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1096 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 678421584 is about 26046.5272925202. The cubic root of 678421584 is about 878.6850125720.

The spelling of 678421584 in words is "six hundred seventy-eight million, four hundred twenty-one thousand, five hundred eighty-four".